Manley Severe Duty series performance valves are a great choice for your high performance or race engine. All valves are made from stainless steel (intakes are NK-844; exhausts are XH-428) with chrome stems and hardened valve tips. Severe Duty series valves are made of superior materials, are fully machined and swirl polished, and are available with either undercut "Pro Flo" stems or straight stems.

More From This Category

MANLEY Valve, Race Master, Exhaust, 31.5 mm Head Dia, 6 mm Stem Dia, 94.0 mm Length, For Nissan VQ35, Set of 12

MANLEY Valve, Race Master, Exhaust, 31.5 mm Head Dia, 6 mm Stem Dia, 94.0 mm Length, For Nissan VQ35, Set of 12

$849.04

Sonnax Oversized 2-6 Clutch Regulator Valve Kit, Ford, 6T70/75 Gen I, 6F50/55, Each

Sonnax Oversized 2-6 Clutch Regulator Valve Kit, Ford, 6T70/75 Gen I, 6F50/55, Each

$114.87

MANLEY Valve, Race Master, Intake, 34mm Head Dia, 0.2355 in. Stem Dia, 4.62 Length, For Ford, Each

MANLEY Valve, Race Master, Intake, 34mm Head Dia, 0.2355 in. Stem Dia, 4.62 Length, For Ford, Each

$51.07

MANLEY Back Cut Valve, Set of 8

MANLEY Back Cut Valve, Set of 8

$76.15

MILODON Valves, Exhaust, Race, Stainless Steel, 1.625 in. Dia, +.200 Long, Small For Chevrolet, 350, 383, 400, Set of 8

MILODON Valves, Exhaust, Race, Stainless Steel, 1.625 in. Dia, +.200 Long, Small For Chevrolet, 350, 383, 400, Set of 8

$432.85

MANLEY Valve, Custom, Titanium, Hollow Stem, Each

MANLEY Valve, Custom, Titanium, Hollow Stem, Each

$499.13